Don't be too quick to pull out that AC. If it is the original Armstrong BayBreeze, it was built to commercial standards and they are tough as nails. The original on my '77 Excella 500 would run you out of the trailer it was so cold. The only thing I had to do was replace the 125 A.C. to 24 v. D.C. transformer to send the signal to the thermostat and I found it at a local elec. supply house. Fan motors, if found to be bad, can be ordered from Graingers or local supply houses. RV places will be quick to sell you a new Coleman, Dometic/DuoTherm Pinguin or Carrier rather than spend any time checking the unit out. Too bad because the Armstrong is a good unit no matter how old it is.
'01 2500hd ext. cab, 8.1 litre gas, 5 sp. Allison auto
3.73 rear end
Mag-Hytec rear diff cover
Amsoil Dual by-pass oil filtration system
Amsoil synthetics all around
265 watt AM Solar, Inc. system